Door Handle Adapter for Sprung Hub

ABSTRACT

An adapter for either a handle set or a lever set door lever is equipped with a pair of springs to provide a pre-load on the spindle. The pre-load prevents sagging of the lever due to the large mass of the lever. A sleeve in the adapter is formed out of a compressible material that accepts the spindle in a press-fit configuration. This allows for greater manufacturing tolerances while still providing a solid and secure engagement between the spindle and the adapter. As a result, any free play in the lever is eliminated and the lever is maintained in a horizontal, home position when the lever is not in use. Following use through rotation of the lever, the springs promptly return the lever back to the home position while the sleeve prevents any slop or free-play in the lever&#39;s motion.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority from U.S. Provisional PatentApplication No. 62/439,974, filed Dec. 29, 2016, the disclosure of whichis hereby incorporated by reference in its entirety.

TECHNICAL FIELD

This invention relates to the field of door locks. More particularly,this invention relates to hub adapters for door handles with removablespindles.

BACKGROUND OF THE INVENTION

Door knobs and levers are known to include springs that return the knobor lever back to a home position. This allows an operator to rotate theknob or lever, retract the latch, and open the door. Releasing the knobor lever allows the spring to use stored energy and return the knob orlever to its original position.

Different springs are also commonly used on door knobs and levers. As alever extends away from the axis of rotation, a greater amount ofresistive force is generated by the mass of the lever. Door knobs have aconsistent mass around the entire rotational axis and do not extend asfar from the rotational axis. For this reason, lighter springs aretypically used on door knobs and heavier springs are used on levers.

One problem associated with sprung levers is that the lever can sag andnot rest at a perfectly horizontal position. Efforts to resolve thisissue have included simply using a stronger spring, but the increasedresistance experienced by the operator is not optimal. Another problemassociated with sprung levers is that the connection of the lever to thelatch mechanism often includes some play, allowing the operator toloosely jiggle the handle. This issue has been addressed in the past bysimply manufacturing pieces with tighter tolerances. Success has beenlimited as the tighter tolerances cause binding and require perfectalignment of the components, which rarely happens in installations.

What is therefore needed is an improved mechanism that prevents saggingof a lever handle. What is also needed is an improved mechanism thatprevents a loose connection of the lever handle thereby minimizing anyfree-play.

SUMMARY AND OBJECT OF THE INVENTION

A door handle adapter comprising: a spindle configured to engage thedoor handle and transfer an input rotational force from the door handle;a hub with a central aperture configured to receive the spindle andfurther transfer the rotational force from the spindle; a first engagerextending from an outer circumference of the hub; a second engageropposite the first engager extending from the outer circumference of thehub; a slider with a first receiver configured to engage the firstengager and a second receiver configured to engage the second engagersuch that as the rotational force is transmitted to the hub, therebyaxially rotating the hub, at least one of the first and second engagerlinearly displace the slider; a first spring configured to engage thefirst receiver when the rotational force is in a first direction andalso when the rotational force is in an opposing direction; a secondspring to engage the second receiver when the rotational force is in thefirst direction and also when the rotational force is in the opposingdirection; and a spacer formed of a material softer and morecompressible than the hub and spindle inserted between the spindle andhub configured to retain a positive engagement between the spindle andhub.

The door handle adapter according to claim 1, wherein the hub is formedof one of zinc, brass, steel, and aluminum, and the spacer is a polymer.

The door handle adapter according to claim 1, further comprising a linerproviding a backstop for the first and second spring, wherein the firstand second receiver provide opposing backstops for the respective firstand second springs, thereby sandwiching at least a portion of eachspring in-between, respectively.

The door handle adapter according to claim 3, wherein the first andsecond receivers are inserted in-between a plurality of coils of therespective first and second springs, thereby engaging the springs whenthe slider is linearly displaced by the axial rotation of the spindleand hub.

The door handle adapter according to claim 1, wherein the slider islinearly displaced in the same direction when the hub is axially rotatedthe first direction as when the hub is axially rotated the opposingdirection.

The door handle adapter according to claim 1, wherein the first andsecond springs maintain a torsional resistance against the inputrotational force at all times.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure will be described hereafter with reference to theattached drawings which are given as non-limiting examples only, inwhich:

FIG. 1 shows a perspective view of an adapter according to an embodimentof the invention;

FIG. 2 shows an exploded perspective view of the adapter of FIG. 1;

FIG. 3 shows a partially exploded perspective view of a handle setinstallation using the adapter of FIG. 1;

FIG. 4 shows a side view of the handle set installation of FIG. 3;

FIG. 5 shows a perspective view of a lever set installation using anadapter according to an alternative embodiment of the invention;

FIG. 6 shows a partially exploded perspective view of the lever setinstallation according to FIG. 5; and

FIG. 7 shows a partially exploded perspective view of the adapter ofFIG. 5.

Corresponding reference characters indicate corresponding partsthroughout the several views. The exemplifications set out hereinillustrate an embodiment of the invention, and such exemplifications arenot to be construed as limiting the scope of the invention in anymanner.

DETAILED DESCRIPTION

Beginning with FIG. 1, an adapter 10 is shown. The adapter 10 isconfigured for installation on an interior side of an entry door. Theadapter 10 is preferably formed of a single-piece with an arm 14 andpair of receivers 16 extending from a flange 12. The flange 12 isintended to rest on the interior surface of a door while the receivers16 and arm 14 protrude into the hole formed into the door for the doorhandle (not pictured). The adapter 10 is also shown in FIG. 2 inexploded form with the spring plate 18 components separated for view.

A slide 22 includes spring stops 24 that extend from the slide 22. Thespring stops 24 contain a spring 20 on each side of hole 42 formed inthe adapter 10. The spring plate 18 contains the springs within springchambers 26 thereby allowing the slide 22 to slide and compress springs20 in the spring chambers 26 and rebound due to the spring force.

The adapter 10 includes a plurality of studs 28 extending from theflange 12. The studs 28 in particular extend from a base 32 that in turnextends from the flange 12, and act as mounting bosses to locate andretain the spring plate 18 in place. Each stud 28 is inserted into anaperture 30 on the spring plate 18 thereby preventing movement of thespring plate 18. The hole 42 formed in the center of the adapter 10 islined up with the opening 41 in the spring plate 18. The opening 41 inthe spring plate 18 includes slots 40 that receive engagers 34 on theouter diameter of a hub 36.

The hub 36 is configured to rotate within the hole 42 of the adapter andopening 41 of the spring plate 18. As the hub 36 rotates, the engagers34 contact one of a first contact 33 and a second contact 35 on theslide 22. The engagers 34 interact with the first contact 33 or secondcontact 35 thereby causing the slide 22 to compress the springs 20within the spring chamber 26. As a result, the hub 36 is compelled torotate back to a “home” position by the stored energy in the springs 20,urging the inside lever 52 (see FIG. 3) in a horizontal position,whenever the hub 36 is rotated. A sleeve 38 may also be inserted intothe central aperture 42 of the hub 36. Preferably, the sleeve 38 is madeout of a compressible material such as plastic.

The sleeve 38 acts as a buffer to take up any play that a spindle 48(shown in FIG. 3) may have with the central aperture 42 in the hub 36.The spindle 48 is therefore preferable pressed into the sleeve 38 suchthat a press-fit is required. Due to the nature of manufacturingprocesses used to form the spindle 48 and hub 36, it is very difficultto eliminate any play between the two components. Incorporating a sleeve38 with a press-fit ensures a consistent, secure mating between theparts without any slop or play.

Referring to FIGS. 3 and 4, the adapter 10 described in FIGS. 1 and 2 isshown in an exploded installation of a handle set for an entry doorapplication. The outside handle 44 is configured for mounting on anexterior side of an entry door (not pictured). A rose 57 conceals themounting points of the outside handle 44 to the door. A switch 56 may bedepressed in order to rotate the spindle 48. The switch 56 is connectedto a mechanical device 53 concealed by the rose 57 in FIG. 3, butviewable in FIG. 4, that converts the linear motion generated when theswitch 56 is depressed into a rotary motion. This rotary motion istransferred to the latch 46, adapter 19, and inside lever 52 by thespindle 48. The spindle 48 also mechanically links the inside lever 52to the adapter 10, latch 46, and switch 56. Preferably, a multi-piecespindle 48 is used and the portion of the spindle 48 in contact with theswitch operates just the latch 46 to avoid movement of the switch 56from rotating the inside lever 52, and vice versa.

A rose 50 conceals the adapter 10 and fasteners 54 that are used tosecure the adapter to the interior side of the door. The fasteners 53pass through the receivers 16 in the adapter 10 and into the posts 60 ofthe outside handle 44. As the fasteners 54 are tightened, the adapter 10and outside handle 44 are drawn together thereby squeezing the door inbetween and securing them to the door. The latch 46 is held in place byboth the spindle 48 passing through the latch 46 and the arm 14 passingthrough the latch 46. The spindle 48 rotates to retract the latch 46while the arm 14 prevents the latch 46 from rotating. A rose trim screw58 fastens to the adapter 10 and maintains the rose 50 secured to theadapter 10.

As previously discussed, the springs 20 and sleeve 38 maintain theinside lever 52 at a home position, as depicted in FIG. 4. The sleeve 38also prevents any rotational slop in the movement of the inside lever52. The result is that a more-positive and secure connection of theinside lever 52 to the spindle 48 and adapter 10.

Another embodiment of the invention is shown in FIG. 5 as a lever set 70incorporating the spring plate 18, slide 22, springs 20, and sleeve 38as shown in FIG. 2. In this embodiment, an exterior lever 74 andexterior rose 76 are mounted to the exterior side of a door (notpictured). An interior lever 72 and interior rose 78 are mounted to aninterior side of the door. The interior lever 72 and the exterior lever74 may be rotated to retract latch 80 thereby allowing the door to open.As there are two levers used in this embodiment as opposed to a singlelever and a handle, there are slight differences from thepreviously-mentioned embodiment. These differences do not affect thefunction of the springs 20, slide 22, spring plate 18, hub 36, andsleeve 38 as described with respect to FIGS. 1 and 2.

FIG. 6 shows an exploded view of the lever set 70. A second adapter 82is shown, one on the interior side and one on the exterior side. Eachadapter 88, 82 includes the same parts and functions similarly. One ofthe adapters is configured to receive fasteners (female fitting) whilethe opposing adapter has through holes (male fitting). The exteriorlever 74 is joined to the spindle 86 thereby allowing rotational force92 to transfer to the second adapter 82, latch 80, adapter 88 andinterior lever 72. As the rotational force 92 is applied to the exteriorlever 74 the adapter 82 adds opposing tension to resist the rotationalforce 92. This opposing tension assists in maintaining the exteriorlever 74 in a home, horizontal position. An exterior rose 76 may also beused to conceal the adapter 82 which is secured to the surface of thedoor. As the adapter 88 used in a lever set 70 application does not havean arm 14 as shown in FIGS. 1 and 2, an adapter bracket 84 is used tosecure the latch 80 in place and prevent rotation as the spindle 86 isrotated by either the exterior lever 74 or the interior lever 72.Fasteners 90 pass through the adapter 88, through the adapter bracket 84and into the adapter 82. The fasteners 90 sandwich the door between theadapter 82 and the adapter 88 while the latch 80 and adapter bracket 84remain within a bore in the door. An interior rose 78 conceals theadapter 88 and the exterior rose 76 conceals the adapter 82.

Referring to FIG. 7, a partially exploded view of the adapter 88,adapter 82, and bracket 84 is shown. The adapter 88 shown in FIGS. 6 and7 is the same as the adapter 10 shown in FIGS. 1 and 2, except that theadapter 88 does not include an arm 14. This is due to the difference inapplication of using a handle set shown in FIG. 3 as opposed to a leverset shown in FIG. 5. The mechanical workings of the adapter 88 do notdiffer from the previously discussed mechanicals of adapter 10 shown anddescribed with respect to FIG. 2.

The adapter 88 shown in FIG. 7 includes a bracket 84 that holds thelatch 80 in position as a rotational force 92 is applied to either lever(see FIG. 6). As previously described, the adapter 88 includes a pair ofreceivers 94 that accept posts 90 from the adapter 82. Studs 106maintain the spring plate 98 and slide 100 in place and secured to thebase 108 of the flange 96. As rotational force 92 is applied (as shownin FIG. 6), the sleeve 104 and hub 102 rotate thereby compressing thesprings within the spring chambers of the spring plate 98 as previouslydescribed with respect to FIG. 2.

With both embodiments of the invention as described with respect toFIGS. 2 and 7, both adapters 10, 88 perform the same functions with thesame components. The only difference is a lack of an arm 14 with theembodiment shown in FIG. 7. As a result, the adapters 10, 88 minimizeany play in the lever through the use of a sleeve 38 shown in FIG. 2 orsleeve 104 shown in FIG. 7. The sleeve is preferably formed out of acompressible material such as plastic allowing for a greater range ofmanufacturing tolerances when constructing the associated spindle. Theoverall goal is to provide a tight, press-fit between the spindle andthe sleeve. The use of springs 20, shown in FIG. 2, also minimizes anyunintended sagging of the lever due to the weight of the lever itself.The springs 20 can therefore be pre-loaded to maintain the levers at thepredetermined home position of horizontal when not in use, despitehaving a great mass due to solid forging manufacturing techniques. Inaccordance with the preceding disclosure various aspects of a doorhandle adapter are disclosed, In one aspect, the door handle adapterincludes a spindle configured to engage the door handle and transfer aninput rotational force from the door handle, as well as a hub with acentral aperture configured to receive the spindle and further transferthe rotational force from the spindle. The door handle adapter includesa first engager extending from an outer circumference of the hub, and asecond engager opposite the first engager extending from the outercircumference of the hub. The adapter includes a slider with a firstreceiver configured to engage the first engager and a second receiverconfigured to engage the second engager such that as the rotationalforce is transmitted to the hub, thereby axially rotating the hub, atleast one of the first and second engager linearly displace the slider.The adapter further includes a first spring configured to engage thefirst receiver when the rotational force is in a first direction andalso when the rotational force is in an opposing direction, as well as asecond spring to engage the second receiver when the rotational force isin the first direction and also when the rotational force is in theopposing direction. The adapter includes a spacer formed of a materialsofter and more compressible than the hub and spindle inserted betweenthe spindle and hub configured to retain a positive engagement betweenthe spindle and hub.

In further examples, the adapter described above may be modified by thehub being formed formed of one of zinc, brass, steel, and aluminum, andthe spacer is a polymer. Stull further, such an adapter can include aliner providing a backstop for the first and second spring, wherein thefirst and second receiver provide opposing backstops for the respectivefirst and second springs, thereby sandwiching at least a portion of eachspring in-between, respectively. The first and second receivers can beinserted in-between a plurality of coils of the respective first andsecond springs, thereby engaging the springs when the slider is linearlydisplaced by the axial rotation of the spindle and hub.

Still further, in some example aspects, the slider of any of the aboveexamples is linearly displaced in the same direction when the hub isaxially rotated the first direction as when the hub is axially rotatedthe opposing direction. Further the first and second springs maintain atorsional resistance against the input rotational force at all times.

In a further example, a door handle adapter includes a hub with an openinner circumference configured to receive a spindle and transfer arotational force input into the spindle, as well as a first engagerextending from an outer circumference of the hub. The door handleadapter further includes a second engager extending from the outercircumference of the hub, as well as a slider with a first receiverconfigured to engage the first engager and a second receiver configuredto engage the second engager such that, as the rotational force istransferred to the hub, the hub axially rotates, thereby urging a lineardisplacement of the slider through contact between one of the firstengager with the first receiver and the second engager with the secondreceiver. The door handle adapter includes a first spring configured toengage the first receiver when the rotational force is in a firstdirection, and a second spring configured to engage the second receiverwhen the rotational force is in a second direction opposing the firstdirection. The door handle adapter includes a spacer, formed of amaterial softer and more compressible than the hub and the spindle,press-fitted between the spindle and hub configured to retain a positiveengagement between the spindle and hub.

In further aspects, the hub of the above door handle adapter is formedof one of zinc, brass, steel, and aluminum, and the spacer is a polymer.The door handle adapter above can further include a liner providing abackstop for the first and second spring, wherein the first and secondreceiver provide opposing backstops for the respective first and secondsprings, thereby sandwiching at least a portion of each springin-between the respective backstop and receiver. In some aspects, thefirst and second receivers are inserted in-between a plurality of coilsof the respective first and second springs, thereby engaging the springswhen the slider is moved. In further aspects, the slider is linearlydisplaced in the same direction irrespective of a direction of therotational force of the hub. In some aspects, the first and secondsprings maintain a torsional resistance against the input rotationalforce at all times.

In a still further example, a door handle adapter includes a hub with anopen inner circumference configured to receive a spindle and transfer arotational force input into the spindle, as well as a first engagerextending from an outer circumference of the hub. The door handleadapter further includes a slider with a first receiver configured toengage the first engager such that as the rotational force istransferred to the hub, the hub axially rotates thereby urging a lineardisplacement of the slider through contact between the first engagerwith the first receiver. The door handle adapter further includes afirst spring configured to engage the first receiver when the rotationalforce is in a first direction. The door handle adapter also includes aspacer, formed of a material softer and more compressible than the huband the spindle, press-fitted between the spindle and hub configured toretain a positive engagement between the spindle and hub.

In further examples, the hub is formed of one of zinc, brass, steel, andaluminum, and the spacer is a polymer. The door handle adapter can alsoinclude a liner providing a backstop for the first spring, as well as abackstop for the first spring formed from a portion of the liner,thereby sandwiching at a portion of the first spring in-between thebackstop and receiver. In such examples, the first receiver is insertedin-between a plurality of coils of the first spring, thereby engagingthe spring when the slider is moved.

In further example aspects, the slider is linearly displaced in the samedirection irrespective of a direction of the rotational force of thehub. Additionally, the first spring maintains a torsional resistanceagainst the input rotational force at all times. The door handle adaptercan further include a second engager extending from the outercircumference of the hub, a second receiver connected to the firstreceiver configured to engage the second engager, and a second springconfigured to engage the second receiver when the rotational force is inthe first direction and also when the rotational force is in a seconddirection opposing the first direction. In such examples, the firstreceiver and second receiver are joined together proximate the hub.

Although the present disclosure has been described with reference toparticular means, materials and embodiments, from the foregoingdescription, one skilled in the art can easily ascertain the essentialcharacteristics of the present disclosure and various changes andmodifications may be made to adapt the various uses and characteristicswithout departing from the spirit and scope of the present invention asset forth in the following claims.

I claim:
 1. A door handle adapter comprising: a spindle configured toengage the door handle and transfer an input rotational force from thedoor handle; a hub with a central aperture configured to receive thespindle and further transfer the rotational force from the spindle; afirst engager extending from an outer circumference of the hub; a secondengager opposite the first engager extending from the outercircumference of the hub; a slider with a first receiver configured toengage the first engager and a second receiver configured to engage thesecond engager such that as the rotational force is transmitted to thehub, thereby axially rotating the hub, at least one of the first andsecond engager linearly displace the slider; a first spring configuredto engage the first receiver when the rotational force is in a firstdirection and also when the rotational force is in an opposingdirection; a second spring to engage the second receiver when therotational force is in the first direction and also when the rotationalforce is in the opposing direction; and a spacer formed of a materialsofter and more compressible than the hub and spindle inserted betweenthe spindle and hub configured to retain a positive engagement betweenthe spindle and hub.
 2. The door handle adapter according to claim 1,wherein the hub is formed of one of zinc, brass, steel, and aluminum,and the spacer is a polymer.
 3. The door handle adapter according toclaim 1, further comprising a liner providing a backstop for the firstand second spring, wherein the first and second receiver provideopposing backstops for the respective first and second springs, therebysandwiching at least a portion of each spring in-between, respectively.4. The door handle adapter according to claim 3, wherein the first andsecond receivers are inserted in-between a plurality of coils of therespective first and second springs, thereby engaging the springs whenthe slider is linearly displaced by the axial rotation of the spindleand hub.
 5. The door handle adapter according to claim 1, wherein theslider is linearly displaced in the same direction when the hub isaxially rotated the first direction as when the hub is axially rotatedthe opposing direction.
 6. The door handle adapter according to claim 1,wherein the first and second springs maintain a torsional resistanceagainst the input rotational force at all times.
 7. A door handleadapter comprising: a hub with an open inner circumference configured toreceive a spindle and transfer a rotational force input into thespindle; a first engager extending from an outer circumference of thehub; a second engager extending from the outer circumference of the hub;a slider with a first receiver configured to engage the first engagerand a second receiver configured to engage the second engager such thatas the rotational force is transferred to the hub the hub axiallyrotates thereby urging a linear displacement of the slider throughcontact between one of the first engager with the first receiver and thesecond engager with the second receiver; a first spring configured toengage the first receiver when the rotational force is in a firstdirection; a second spring configured to engage the second receiver whenthe rotational force is in a second direction opposing the firstdirection; and a spacer, formed of a material softer and morecompressible than the hub and the spindle, press-fitted between thespindle and hub configured to retain a positive engagement between thespindle and hub.
 8. The door handle adapter according to claim 7,wherein the hub is formed of one of zinc, brass, steel, and aluminum,and the spacer is a polymer.
 9. The door handle adapter according toclaim 7, further comprising a liner providing a backstop for the firstand second spring, wherein the first and second receiver provideopposing backstops for the respective first and second springs, therebysandwiching at least a portion of each spring in-between the respectivebackstop and receiver.
 10. The door handle adapter according to claim 9,wherein the first and second receivers are inserted in-between aplurality of coils of the respective first and second springs, therebyengaging the springs when the slider is moved.
 11. The door handleadapter according to claim 7, wherein the slider is linearly displacedin the same direction irrespective of a direction of the rotationalforce of the hub.
 12. The door handle adapter according to claim 7,wherein the first and second springs maintain a torsional resistanceagainst the input rotational force at all times.
 13. A door handleadapter comprising: a hub with an open inner circumference configured toreceive a spindle and transfer a rotational force input into thespindle; a first engager extending from an outer circumference of thehub; a slider with a first receiver configured to engage the firstengager such that as the rotational force is transferred to the hub, thehub axially rotates thereby urging a linear displacement of the sliderthrough contact between the first engager with the first receiver; afirst spring configured to engage the first receiver when the rotationalforce is in a first direction; and a spacer, formed of a material softerand more compressible than the hub and the spindle, press-fitted betweenthe spindle and hub configured to retain a positive engagement betweenthe spindle and hub.
 14. The door handle adapter according to claim 13,wherein the hub is formed of one of zinc, brass, steel, and aluminum,and the spacer is a polymer.
 15. The door handle adapter according toclaim 13, further comprising: a liner providing a backstop for the firstspring; a backstop for the first spring formed from a portion of theliner, thereby sandwiching at a portion of the first spring in-betweenthe backstop and receiver.
 16. The door handle adapter according toclaim 15, wherein the first receiver is inserted in-between a pluralityof coils of the first spring, thereby engaging the spring when theslider is moved.
 17. The door handle adapter according to claim 13,wherein the slider is linearly displaced in the same directionirrespective of a direction of the rotational force of the hub.
 18. Thedoor handle adapter according to claim 13, wherein the first springmaintains a torsional resistance against the input rotational force atall times.
 19. The door handle adapter according to claim 13, furthercomprising: a second engager extending from the outer circumference ofthe hub; a second receiver connected to the first receiver configured toengage the second engager; a second spring configured to engage thesecond receiver when the rotational force is in the first direction andalso when the rotational force is in a second direction opposing thefirst direction.
 20. The door handle adapter according to claim 19,wherein the first receiver and second receiver are joined togetherproximate the hub.